Patent US4770959A successfully refreshed from Google Patents.
US4770959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lithium-fluorinated graphite cell
Assignee: Daikin Industries Ltd
•
Filing: 1986-12-19
•
Granted: 1988-09-13
•
Expires: 2006-12-19
Abstract
Abstract Organic electrolyte cells comprising a lithium anode and a fluorinated graphite cathode, and using a solution of lithium hexafluorophosphate (LiPF 6 ) in an organic solvent as the electrolyte, whereby the discharge capacity is remarkably improved.
Inventors
- 👤 Satoshi Koyama
- 👤 Tadayuki Maeda
- 👤 Kazuo Okamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:37
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/14; H01M6/16; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
72 words
In an electrochemical cell comprising a lithium anode, a cathode comprising fluorinated graphite, and an organic electrolyte, wherein said organic electrolyte comprises a solute and a solvent, the improvement which comprises using lithium hexafluorophosphate (LiPF 6 ) as the solute of said organic electrolyte and using as the solvent of said organic electrolyte a solvent consisting essentially of a member selected from the group consisting of propylene carbonate, γ-butyrolactone, tetrahydrofuran and 1,2-dimethoxyethane.
Claim 2
Dependent Claim
72 words
In an electrochemical cell comprising a lithium anode, a cathode comprising fluorinated graphite, and an organic electrolyte, wherein said organic electrolyte comprises a solute and a solvent, the improvement which comprises using lithium hexafluorophosphate (LiPF 6 ) as the solute of said organic electrolyte and using as the solvent of said organic electrolyte a solvent consisting essentially of a member selected from the group consisting of propylene carbonate, γ-butyrolactone, tetrahydrofuran and 1,2-dimethoxyethane.
Claim 3
Dependent Claim
64 words
In an electrochemical cell comprising a lithium anode, a cathode comprising fluorinated graphite, and an organic electrolyte, wherein said organic electrolyte comprises a solute and a solvent, the improvement which comprises using lithium hexafluorophosphate (LiPF 6 ) as the solute of said organic electrolyte and using as the solvent of said organic electrolyte a solvent consisting essentially of a mixture of γ-butyrolactone and acetonitrile.
Claim 4
Dependent Claim
64 words
In an electrochemical cell comprising a lithium anode, a cathode comprising fluorinated graphite, and an organic electrolyte, wherein said organic electrolyte comprises a solute and a solvent, the improvement which comprises using lithium hexafluorophosphate (LiPF 6 ) as the solute of said organic electrolyte and using as the solvent of said organic electrolyte a solvent consisting essentially of a mixture of γ-butyrolactone and acetonitrile.
References Cited (Backward Citations)
US3639174A
Cited
US3985577A
Cited
US3928070A
Cited
US3871916A
Cited
US3907597A
Cited
US3953235A
Cited
DE2503234A1
Cited
US3990915A
Cited
JPS6165277A
Cited
JPH111267A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-13 | 1992-03-14 | 1992-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-13 | 1996-03-14 | 1996-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-13 | 2000-03-14 | 2000-09-13 | $7700.00 | Window Closed / Lapsed |